The app he used was called centr
Looks like a great workout routine with a diet plan.
It is great to see someone set a goal and stick to it for a long period of time and do the transformation.
In the second video Chris Hemsworth puts out a good quote paraphrasing that
Movement creates motivation
Basically move your body and you will have that transformation because you will have that motivation.
Another take-away is the sticking to a workout to get it part of your habits.
GREAT GOAL: Find a fitness plan that works that fits into a great lifestyle and helps you create better habits for a healthier self.